Season 30 Episodes13
Cast1

Lynne Adams
Narrator (voice)
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Ranked #5 of 13 in Season 30•matches the season avg
Steel columns, steps and railings are measured, shaped and welded into space-saving spiral staircases. Yeast dough is mixed, divided and baked at high temperature so steam inflates each pita; metal tubing is bent and welded into exhaust headers; and crushed limestone mixtures are cast and

Lynne Adams
Narrator (voice)
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"Spiral Stairs, Pita Bread, Exhaust Headers, Moulded Limestone Artwork" is episode 6 of How It's Made season 30. It scored 7.9/10 from 13 votes, ranking #5 of 13 episodes this season (season average 7.9). It aired on October 30, 2017.